T0777 Attachment 5 - Spreading Services Guide.pdf

This document is the Solid Chemical Application Guidelines for an Effective Anti-icing Program prepared by the New Jersey Department of Transportation (NJDOT) for its Winter Maintenance Program. The guidelines are adapted from the Manual of Practice for an Effective Anti-icing Program originally developed by the Federal Highway Administration (FHWA) and the US Army Cold Regions Research and Engineering Laboratory, Corps of Engineers in 1996.

The document provides operational guidance for the application of solid de-icing chemicals across five distinct weather events: light snow storms, moderate or heavy snow storms, frost or black ice conditions, freezing rain storms, and sleet storms. For each weather scenario, the guidelines specify maintenance actions, chemical application rates (measured in pounds per lane-mile), and operational procedures based on pavement temperature ranges. Chemical spread rates vary significantly by temperature and weather conditions, ranging from no application above 32°F in steady or rising conditions to rates between 150 and 400 pounds per lane-mile in colder conditions. The guidelines distinguish between initial operations and subsequent operations, with recommendations to apply pre-wetted solid chemicals, conduct pre-treatment ahead of traffic rush periods, plow before chemical applications to remove excess accumulation, and monitor pavement conditions continuously. Critical considerations include timing applications to prevent ice formation, adjusting application frequency based on traffic volume and condensation levels, and avoiding chemical application in temperatures below 15°F where abrasives are recommended instead.